Biotech imports HS code classification

* Automobile engine composition - automobile engine structure: in-depth analysis Automobile engine is Biotech imports HS code classificationone of the core components of automobiles and the main source of automobile driving power. Automobile engines are composed of hundreds of precision parts, which are the products of mechanical, electronic, chemical, thermal and other multidisciplinary intersections. This article will deeply analyze the main parts of the structure of automobile engines. I. Cylinder block is one of the most important components of the engine. It is made of aluminum alloy or cast iron, and other parts can be installed in it. One of the main tasks of the cylinder block is to provide a strong support structure because it needs to withstand the explosion of high-pressure gas. In addition, the cylinder block has exhaust and intake channels, which can only be accessed through the gap between the piston and the cylinder block.II. The cylinder head is a part that closely covers the cylinder block, which has the same function as the cylinder wall. There are exhaust and intake ducts, spark plug holes, rocker arms and other components on the cylinder head. In a four-stroke engine, the intake valve and exhaust valve on the cylinder head are controlled by components such as camshaft and rocker arm, which are controlled by the flow of inflow and out of gas from these valves. III. The piston and connecting rod piston and connecting rod constitute the most important mechanical connection part in the internal combustion process of the engine. The piston controls the movement of the gas in the cylinder, and the connecting rod is used to connect the piston to the crankshaft. Although pistons and connecting rods are fundamentally "simple" structures, they must be very strong and suitable for the task, subjecting to great pressure and thermal shock during the sowing-engine internal combustion process. At the same time, a certain lightweight design is needed to avoid additional energy consumption.IV. The crankshaft is one of the most important parts of the engine, which is made of steel. The crankshaft converts the kinetic energy of the gas discharged from the cylinder into the output shaft torque through a specific geometric structure and periodic displacement. When the crankshaft rotates, it will drive other mechanical parts, such as fans, pumps, etc., and provide sufficient power for the car. V. The camshaft and the camshaft of the valve transmission system are another important component of the engine. It is responsible for controlling the intake and exhaust processes in the engine. The camshaft is installed in the cylinder head and controls the gas flow in the piston and cylinder through the valve transmission system. Generally speaking, the structure of the camshaft adopts a cam design with different profiles, so that the cam can change the relative position in the entire cylinder and its surrounding area to control the opening of the valve. VI. Fuel injector and ignition system fuel injector are important parts of modern automobile engines.Its main task is to inject fuel into the cylinder to make the mixture in the cylinder achieve the best combustion effect, so as to obtain better fuel utilization and higher power. The ignition system is used to ignite the mixture to start and drive the engine. The ignition system consists of high-voltage electronic devices and spark plugs, which are located right on the cylinder head. In summary, the car engine is a very complex mechanical system, which requires the coordinated operation of various components. The above components are the most important components of the engine. Reasonable configuration and high-quality design can make the engine have higher energy efficiency, stronger power output and lower emission levels to meet the increasing demand of the automobile market.

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